A coolie carries a load of 50kg on his head and walks on a level road up to 100m. what is the work done by him.
How many atoms of oxygen are present in 50 g of calcium carbonate?
A 2m high person is holding a 25kg trunk on his head and is standing at a roadways bus- terminus. how much work is done by the person ?
Name the disease causing microbes that lives and remains active inside the host cell?
1) calculate the number of molecules in 50g of calcium carbonate
2) calculate the number of moles for the following.
a.64g of oxygen atom
b.24*10 powered by 23 number of oxygen atom
3)calculate the formula unitmass of
a) calcium chloride b) sodium sulphite c) ammonium carbonate
4) calculate the no. of moles sulphur (Sg) present in 16g of solid sulphur
5) write the chemical formula using criss cross method
a)ammonium sulphate b)sodium sulphate c) barium nitrate
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